Question

Помогите пожалуйста, желательно побыстрее 1. Определите молекулярную массу следующих веществ.1. Al2(SO4)32. K2SO43. Fe2(SO4)32. Определите массовую долю следующих веществ. 1. Na2SO42. HNO33. H2SO43.Напишите электронные конфигурации следующих элементов.1. Br- бром 2.Kr- криптон 3. As- мышьяк4. 14 грамм натрий взаимодействует с кислородом. Определите массу оксида натрия.5.Назовите соли: а) Zn(NO3)2; б) NaH2SbO4; в) K2H2P2O7; г) Al(OH)2NO3; д) CaCrO4; е) K3AsO4; ж) Na2Cr2O7; з) Ba(HSO3)2; и) CrOHSO4; к) (CuOH)2CO3; л) NaHS.

Answer 1

Ответ:

1) 1. 342 гр/ моль;

2. 174 гр/моль;

3. 400гр/моль

2) массовая доля - масса элемента которого мы ищем ÷ на массу всего вещ-ва, т.е. не указано именно массовую долю какого элемента нужно найти

3) Вr

1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^5

Kr

1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6

As

1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^3

4) a, д, е, ж- средняя

б, в, з, л - кислые

г, и , к - основные

Answer 2

Molar Mass of Substances:

1. Al2(SO4)3: - The molar mass of aluminum sulfate (Al2(SO4)3) can be calculated by adding up the atomic masses of its constituent elements. - The atomic mass of aluminum (Al) is 26.98 g/mol, sulfur (S) is 32.07 g/mol, and oxygen (O) is 16.00 g/mol. - Therefore, the molar mass of Al2(SO4)3 is calculated as follows: - (2 * Al) + (3 * S) + (12 * O) = (2 * 26.98) + (3 * 32.07) + (12 * 16.00) = 342.15 g/mol [[1]].

2. K2SO4: - The molar mass of potassium sulfate (K2SO4) can be calculated by adding up the atomic masses of its constituent elements. - The atomic mass of potassium (K) is 39.10 g/mol, sulfur (S) is 32.07 g/mol, and oxygen (O) is 16.00 g/mol. - Therefore, the molar mass of K2SO4 is calculated as follows: - (2 * K) + S + (4 * O) = (2 * 39.10) + 32.07 + (4 * 16.00) = 174.26 g/mol [[2]].

3. Fe2(SO4)3: - The molar mass of iron(III) sulfate (Fe2(SO4)3) can be calculated by adding up the atomic masses of its constituent elements. - The atomic mass of iron (Fe) is 55.85 g/mol, sulfur (S) is 32.07 g/mol, and oxygen (O) is 16.00 g/mol. - Therefore, the molar mass of Fe2(SO4)3 is calculated as follows: - (2 * Fe) + (3 * S) + (12 * O) = (2 * 55.85) + (3 * 32.07) + (12 * 16.00) = 399.88 g/mol [[3]].

Mass Fraction of Substances:

1. Na2SO4: - The mass fraction of sodium sulfate (Na2SO4) can be calculated by dividing the molar mass of each element by the molar mass of the compound and multiplying by 100%. - The molar mass of Na2SO4 is 142.04 g/mol. - The atomic mass of sodium (Na) is 22.99 g/mol, sulfur (S) is 32.07 g/mol, and oxygen (O) is 16.00 g/mol. - Therefore, the mass fraction of Na in Na2SO4 is calculated as follows: - (2 * Na) / Na2SO4 * 100% = (2 * 22.99) / 142.04 * 100% = 32.34% [[4]].

2. HNO3: - The mass fraction of nitric acid (HNO3) can be calculated by dividing the molar mass of each element by the molar mass of the compound and multiplying by 100%. - The molar mass of HNO3 is 63.01 g/mol. - The atomic mass of hydrogen (H) is 1.01 g/mol, nitrogen (N) is 14.01 g/mol, and oxygen (O) is 16.00 g/mol. - Therefore, the mass fraction of H in HNO3 is calculated as follows: - H / HNO3 * 100% = 1.01 / 63.01 * 100% = 1.60% [[5]].

3. H2SO4: - The mass fraction of sulfuric acid (H2SO4) can be calculated by dividing the molar mass of each element by the molar mass of the compound and multiplying by 100%. - The molar mass of H2SO4 is 98.09 g/mol. - The atomic mass of hydrogen (H) is 1.01 g/mol, sulfur (S) is 32.07 g/mol, and oxygen (O) is 16.00 g/mol. - Therefore, the mass fraction of S in H2SO4 is calculated as follows: - (1 * S) / H2SO4 * 100% = 32.07 / 98.09 * 100% = 32.70% [[6]].

Electronic Configurations of Elements:

1. Br- (bromine): - The electronic configuration of bromine (Br) is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5. - When bromine gains an electron to form the bromide ion (Br-), it acquires a stable noble gas configuration of 1s2 2s2 2p6 3s2 3p6 (the electron configuration of krypton, Kr) [[7]].

2. Kr- (krypton): - The electronic configuration of krypton (Kr) is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6. - When krypton gains an electron to form the kryptonide ion (Kr-), it acquires a stable noble gas configuration of 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 (the electron configuration of krypton itself) [[8]].

3. As- (arsenic): - The electronic configuration of arsenic (As) is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p3.

Mass of Sodium Oxide:

4. 14 grams of sodium (Na) reacts with oxygen (O) to form sodium oxide (Na2O). - The balanced chemical equation for this reaction is: 4Na + O2 -> 2Na2O. - From the equation, we can see that 4 moles of sodium react with 1 mole of oxygen to produce 2 moles of sodium oxide. - The molar mass of sodium oxide (Na2O) is 61.98 g/mol. - To calculate the mass of sodium oxide formed, we can use the following steps: - Calculate the number of moles of sodium: 14 g / (22.99 g/mol) = 0.608 mol. - Calculate the number of moles of sodium oxide: (2/4) * 0.608 mol = 0.304 mol. - Calculate the mass of sodium oxide: 0.304 mol * (61.98 g/mol) = 18.7 g [[9]].

Naming Salts:

а) Zn(NO3)2: Zinc nitrate. б) NaH2SbO4: Sodium hydrogen antimonate. в) K2H2P2O7: Potassium dihydrogen diphosphate. г) Al(OH)2NO3: Aluminum hydroxide nitrate. д) CaCrO4: Calcium chromate. е) K3AsO4: Potassium arsenate. ж) Na2Cr2O7: Sodium dichromate. з) Ba(HSO3)2: Barium bisulfite. и) CrOHSO4: Chromium hydrogensulfate. к) (CuOH)2CO3: Copper(II) hydroxide carbonate. л) NaHS: Sodium hydrosulfide.

I hope this helps! Let me know if you have any further questions.